This would negate all the benefits provided by the OBD II generic scan tool standard/J1962. How does this change in service procedures impact aftermarket repair facilities? If ECM reprogramming could be performed only with factory scan tools, aftermarket shop owners and technicians would be required to purchase those tools. Reprogrammable memory technology embedded within the ECM allows the vehicle manufacturer to reprogram or recalibrate the ECM and correct issues that may have been unforeseen when the vehicle was originally manufactured. The cost of replacing thousands of ECMs would be significant. In the past, if a driveability- or emissions-related issue was determined to be ECM-related, the only solution was ECM replacement. J2534 is the Society of Automotive Engineers (SAE) standard identifier for "Recommended Practice for Pass-Thru Vehicle Programming." The standard was developed because industry professionals working on diagnostic standardization recognized that vehicle manufacturers were moving toward on-board ECM reprogramming to correct driveability and emissions issues.
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